<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        @import url("03父类引用.css");
    </style>
</head>
<body>
    <div class="box">
        我是div，移动上来看看颜色
        <p class="box_p">
            我的class是box_p，刚好box和父类的class值一样
        </p>
    </div>
</body>
</html>